A school-district IT team wants its Antigravity coding agent to open and update tickets in its existing helpdesk system as part of its normal workflow. Which mechanism should the team build to give the agent this third-party system integration?
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Short Explanation
Knowing a ticketing system exists and actually being able to reach into it are two different things, like reading a manual for a vending machine versus having the key to it. A plugin or extension is what hands the agent an actual key — callable access to the helpdesk API — instead of just background knowledge about how ticketing works. Build the integration, and the agent can open and update real tickets, not just talk about them.
Full Explanation
The mechanism is tool access: a plugin or extension wires an external system's API into the agent so it can take real actions, such as creating or updating a helpdesk ticket, rather than only reasoning about that system in the abstract. A skill document without accompanying tool access supplies procedural knowledge about the ticketing workflow but gives the agent nothing to actually call, so it can describe what should happen without being able to make it happen — a common trap when a team assumes documentation alone enables action. A rules file shapes the agent's behavior and tone across a session, which might get it to reference tickets in conversation, but a behavioral instruction is not a connection to an external API and cannot itself create a ticket. Delegating the entire task to a subagent addresses coordination between multiple agents, not the underlying question of how any agent reaches an external system — the subagent would still need the same plugin or extension to talk to the helpdesk. The caveat: the integration should scope the agent's permissions to only the ticket operations it actually needs, not the whole helpdesk admin surface. Operational check: verify a test run produces a ticket visible in the helpdesk system itself, not just an agent response claiming one was created.